ICM - Calculation Minimum Edge

[Dirk72]

If you use the ICM to make a push/fold decision, you need a minimum edge between push equity and fold equity before pushing.

SNGWiz is using this formula to calculate the minimum edge :
Edge = EM * S * (P - 1) / (100 * BB);
where:
EM = an edge multiplier you can define
S = the smaller of your stack size and the biggest potential opponent stack size.
P = the number of players in the hand.
BB = the size of the big blind.

Does anyone has experience in calculating this Edge and what do you use as Edge Multiplier?